Strain-insulator



(No Model.) L. MGCARTHY.

STRAIN INSULATOR.

No. 605,741.` Patented Jun@ 14,1898.

y lul1l1111111111111111111q//A WIM111111111111111111111111111111111111111 "Il Il',

Za'nesses: fnvenzo 7":

@Mm 5? 16m (MM5. @www we norm s p UNTTnn STaTirs PATENT Ormea.

LOUIS lWICOARTHY, OF BOSTON, MASSACHUSETTS.

STRAlNelNSULATOP.

SPEGIFICATIONformng part of Letters Patent No. 605,741, dated J une 14, 1898.

Application led January 18, 1898. Serial No. 667,041. (No model.)

To @ZZ whom t may concern:

Beit known that I, LOUIS MOOARTHY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Strain-Insulators, of which the following is a specification, reference being had therein to the accompanying drawings.

Straindnsulators are frequently employed in the overhead-wire supports for electric railways and for similar purposes. Such insulators are frequently provided with a turnbuclrle device, so that not only is one part of the wire or other iiexible support insulated from the other portion but the support may also be tightened by the aid of the turnbuckle.

My present invention is an improvement on the strain-insulator shown in Letters Patent granted to me January 10, 1893, No, 489,658. In the device shown in my said patent the sleeve portion of the turnbuclzle is in part located within the insulating portion of the device, said sleeve portion forming one of the connections of the insulator. By this arrangement the rotatable member of the turnbuckle is in part within the case of the insulator proper, and this is objectionable, since it is not desirable to have a movable part located within the shell of. the insulator proper and in proximity to the insulation. By the construction hereinafter described, which embodies my present invention, l am enabled to obviate these objections.

My present invention will be clearly understood from the following description, in which reference is made to the accompanying drawings.

The novel features of my device are pointed out in the claims at the close of this specilication.

In the said drawings, Figure 1 is a View of an insulator embodying my invention. Fig. 2 is a similar view, partially in section, to show more clearly the interior construction. Fig. 3 is a similar view, the section being on a plane at right angles to the plane of the section in Fig. 2.

Referring to the drawings, A and B are interlocking members, which are embedded in any well-known manner in a globular mass D of insulating material,which is molded around the interlocking ends of the members A and B under pressure while in a plastic condition and is then allowed to set and harden. The precise construction of this portion of the device isnot material to my present invention. Any well-known form of strain-insulator having insulated connections may be employed in place of the connections A B and insulating material D.

The `outwardly-projecting end of the connection A is preferably provided with an eye, by means of which it may be secured to a wire or other support. The outwardly-projecting end of ythe connection B is provided with an enlargement or boss 2, the exterior of which is screw-threaded, as shown at 3. Adjacent the portion 2 is placed the head or enlarged end 5 of the coupling member or sleeve G. A cylindrical case or sleeve 7, which is interiorly threaded and which is provided with an inwardly-projecting annular liange 8 is then placed on the sleeve 6, the threaded bolt 9 being first removed from the sleeve, and the said case or union 7 is screwed onto the portion 2 of the connection B. The inwardlyturned flange S engages the shoulder 10 of the sleeve or coupling member 6 and prevents the head or enlarged end 5 of the said member from being withdrawn from the said case or union 7, while at the same time the said sleeve is free to be rotated. The sleeve or coupling member G `and the connection B are thus united by a swivel-joint. The outer or free end of the sleeve 6 is interiorly threaded to receive the threaded bolt 9, the latter having at its outer end ahead provided with an eye, by means of which attachment may be made to a wire or other support. For the purpose of preventing the case 7 from turning with the member (5 or from becoming otherwise disengaged or displaced l employ a pin l1, which may be plain or threaded and which is inserted in a hole drilled through the sleeve or case 7 and into the head or enlarged portion 2 of the connect-ion B, as will be clear from Figs. 1 and 2. The outer or free end of the coupling member or sleeve 6 is preferably squared, as shown at l2, or otherwise tted to receive a wrench, by means of which the said sleeve may be turned.

As will be clear, an insulator constructed as above described may be used to tighten or 9. @oath-ii loosen the support With which it is connected without the slightest danger ol affecting,v the insulation. No movable portion ol the device is Within the insulation, but is Wholly outside the'lat-ter, so that no opening` er joint is formed in the insulation for any purpose. The danger, therefore, of impairing the insulation, especially when the device is subject to great strain, is reduced to a minimum.

1. An insulator comprising,` metallic portions separated from each other by interposed insulating,- material, a ease, as 7, secured to the projecting' end of one ol said connections outside said insulating material, a sleeve secured at one end Within said ease and provided with a screw-threaded bolt whereby as the sleeve is turned the bolt may be screwed into or out of the sleeve to tighten or loosen the supporting' Wire, substantially as described.

2. ln an insulator the combination ol? me tallie portions separated from each other by interposed insulating,` material, the case 7 having the inwardly-projeeting flange 8, the sleeve and bolt f), substantially as described.

3. A strain-insulator comprising metallic portions separated from each other by intorposedinsulating material, a coupling member connected with a projecting part ol'I one ol" said metallic portions outside of the insulating material by a swivel-joint, and a connector having an adjustable screw-threaded union with the said coupling member, substantially as described.

ln testimony whereof l al'lix my signature in presence of two Witnesses.

lVit-nesses:

WM. A. Maenner), Unas. F. ItANiDAmu. 

